Perhaps you should try some spelling variations:
sach tao » sach dao, sach bao, sach tai
tao nang » cao nang, tao bang, tai nang
nang cau » nang cao, hang cau, nang dau
dua tren » dung tren
vu sach » vu bach, su sach, vu khach
hanh va » hang va, hanh vi
cuu tre » cua tre, cau tren, cau treo
cuc ban » cua ban, cac ban, cuu ban
xuc ban » duc ban, quoc ban, xuat ban
va cam » va cham, va cac, va cao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach tao nang cau hoi. lieu va cam ((xuc ban) OR (cuc ban)) hanh va ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach tao nang cau hoi. lieu va cam ((xuc ban) OR (cuc ban)) hanh va ((dua tren) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach tao nang cau hoi. lieu va cam ((xuc ban) OR (cuc ban)) hanh va ((dua tren) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: vu sach tao nang cau hoi. lieu va cam ((xuc ban) OR (cuc ban)) hanh va ((dua tren) or (cuu tre))*.